www.ModulusArms.com | AR-15 Jig Instructions
Rear Shelf Drilling: Slide the 3/8” drill stop onto the drill bit. Insert the drill bit into the depth gauge in
slot labeled “B” as shown in Figure 12. Make sure the drill bit is inserted all the way into the slot and
tighten the drill stop onto the drill bit. Next, drill the three holes visible in the rear shelf template
opening as shown in Figure 13. Be sure to drill to the depth specified with the drill stop and do not go
any further.
Note: Modulus Arms forged lower receivers have some of the rear pocket already machined.
You must only drill the hole closest to the trigger slot template.
Note: Be sure the drill stop is tight. Check the placement of the drill stop with the depth gauge
after each hole.
Figure 12: Slot B
Figure 13: Rear Shelf Drill Location
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